Centrifugal, turbine, and similar pump.



w. n. CARTER. -CENTHIFUGAL,TURBINE,`AND SIMILAR PUMP. AIPLICATIO'N FILED MAY 29.I9I6.

Emma Mar'. 26, 1918;

3 SHEETS-SHEET vI l l 1441.11/ III'- Wl TN ESSES W. D. CARTER. 'r C ENTRIFUGAL, TURBINE, AND'SIMILAR PUMP. APPLICATION mgn'mxf 29 Isls.

Afatemi Mar; 20, .1918.v

3 SHEETS-SHEET 2.

IN V EN TOR.

pellers supported on a single shaft.

full. Fig. 7 is a top view WILLIAM DOUGLAS CARTER, OF SAN JOSEl CALIFORNIA.

CENTRIFUGAL, TURBINE, AND SIMILAR, PUMP.

Specc'ation of Letters Ifatent.

Patented Mar. 26, 1918.

Application filed May 29, 191s. 'serial No. 100,712.

To all whom it may concern:

Be it known that I, VILLIAM DOUGLAS CARTER, a citizen of the United States, residing in San Jose. in the county of Santa Clara and State of California,v have invented certain new and useful Improvements in Centrifugal, Turbine, and Similar Pumps, of which the following is a-specilication.

'This invention relates construction for centrifugal, turbine, 0r similar pumps of those types known as multi-impellei and multistage pumps, in the former of which the two or more impellcrs operate in parallel, and in the latter in series.

The object of this invention is to effect readily in one pump the combination of several impellersc in series. parallel, or multiple series, so that the pump may have to an improved 'a widerrange of efficient service, without the necessity of a change of speed. This quality is particularly desirable in pumps which are directly connected to constant speed'motors, and it makes it possible to manufacture cheaply single speed directly connected stock pumps which can be used efficiently for a great many different conditions of service.

The nature and scope of this invention are more fully explained in thc following description, taken in connection with the accompanying drawings forming part hereof, in which,

Figure l is a cross section taken on line 1 of Fig. 2, of a pump having a specially constructed double service impeller which operates in effect as two separate impellers. Fig. 2 is a longitudinal section of the above pump with side of pump and part of discharge opening shown in full. Fig. 3 is a cross section taken on line 2 of Fig. 4 of a similar pump having two *double service im- Fig. 4 is a longitudinal section of pump shown in Fig..3, with part of one side containing suction and discharge openings shown in full. Fig. 5 is a cross section taken on line 3 of Fig. 6, also showing in full the Suction and discharge flanges and part of end view of a. diii'erently constructed pump having two single impellcrs. Fig. 6 is a longitudi nal section of the last mentioned pump with part of suction opening and side shown in of Fig. 6. Figs. 8 and 9 are sectional views, similar to Figs.

a position where a series flow through the double runner is permitted.

Similar letters refer `to similarI parts throughout the several views.

In Figs. 2 and 4 specially constructed double service impellers are shown making the pump design more compact; but it will be observed that in so far as the fiow of water through the pump is concerned, the operation is the same as where two or more separatcimpellers are employed.

Referring particularly to Figs. l and 2, I is a double service impeller designed with two separate passages E and O so that the iow of water in either half is independent ofthe flow in the other half. F is the pump shaft carrying impeller I. Surrounding impeller I is a movable cylindrical casing (if containing suction passage K with opening or port` L, and symmetrically arranged `discharge passages N and P with ports Q and R respectively. Said ports L, Q, and R are arranged in a longitudinal row in the outside surface of said cylindrical casing C. M

l and 2, but showing the casing C turned to is a base with a cylindrical surface or seat J which supports and closely fits the outside cylindrical surface of casing C. Base M contains manifold passages with main suction opening S, and main discharge opening 'D,. and other openings or ports in said cylindrical seat J `which are either'closed by the cylindrical surface of casing C, or are connected with said ports L, Q, and R in casing C, according to theL relative position of said casing C on said cylindrical seat J'. Suction passage T permanently connects suction opening S with passage O of impeller I. The longitudinal axis of cylindrical seat .L and the longitudinal axis of cylindrical casing C are concentric with that of impeller I and shaft F, so that casing C may be rotated on seat J without interfering with the rota.- tion of impeller I and shaft F. When cas ing C has beer. rotated on cylindrical seat J until ports L.. Q, and coincide with the ports of manifold passages in hase selectcd to connect the passages of impeller I in series or in parallel. as service conditions may require, screw U is tightened so as to hold casing C in its selected position. ceptacle V which is formed y an extension of the sides of base M may be filled with water in order to seal the joint formed between the outside cylindrical surface of casing C and cylindrical seat J and thereby prevent the leaka e of air into passages of casing C 'or mani old in base M which may be below atmosphericpressure.

When it is desired to o erat'e the two halves of impeller I in paral el so as to discharge the Ycombined volume of water against. thc same pressure as that created by either half of impellerusinglyxcasing C is locked in position shown-in Figs. 1 and\2.

The 4flow of water' is then asy shown by the larrows: Entering at suction openinfr S part. of the water goes through passage I to passage O of impeller I, and the remainer through manifold vpassage W, port L and passage K to passage E of impeller I. Discharge passages P and N conduct the water received lunder equal pressure from passages O and E of impeller'I through ports R and Q respectively to main discharge opening D.4

When on the other hand it is desired to I operate the two halves of impeller I in series i endently 4by so as to discharge half of the above volume r`against the combined pressures created indethe two halves of impeller I, then casing C is moved to the position shown in Figs. 8 and 9 and the flow of water is as shown by the arrows; Referring to both Figs. 8 and 9, water entering at main suction opening S, follows' along the course shown by the arrows through passage T Vto passage O ofimpeller I, thence through discharge assageP and port R to manifold passage y which conducts the water through port L and passage K of casing C to passage E of impeller I which in turn adds its supply of pressure energy to the water, and discharges through Nas indicated and out main dischar e opening D.` It is thus possible without c anging in any manner the piping connected withv the main suction or discharge base M contains manifoldpassages 2, 3 and 4 and ports so that three instead of two different combinations `of service are possible. In other words since there are two double service', or in effect, four single impellers, all four may be operated in parallel,

or in series, or else the four impellers may be operated -in parallel pairs and those pairs in series.

The casing C is provided with four volute or discharge passages, .each having a discharge port 5. The casing is adapted to be turned in the base member M and the ports or passages 5 may, therefore, ,be brought into register with either of the three rows lof passages 2, 3 or 4. The ports 5 when in i register with the passages L permit all four impellers to operate in parallel, as shown 1n Figs. 3 and 4;, thereby discharging four vol- Aurnes of water` under a pressure equal toA that created by one impeller, for instance,

ten pounds pressure.

. Registry of the ports 5 with the passages 3 causes lthe first pair of impellers to discharge their combined two volumes in 4series through the second pair of impellers, `thereby doubling the water pressure or increasing it to twenty pounds but reducing the volume by one-half. Registry of the ports 5 with the l' passages 2 causes all'four impellersto opcrate in series, thereby decreasing the volume of water to one-quarter but increasing the pressure vfour times or raising it to forty pounds.

Figs. 5, 6, and 7 illustrate another construction for accomplishing the same result as described in Figs. 1 and 2. In this construction two single impellersI are shown,

although one double 'service impeller could have been employed. The chief diiference lies vin the fact that the manifold passages instead of being stationary and contained in the base are embodied in a separate'movable section consisting of manifold G Imounted on pump casing C. A slot B in manifold G permits it to slide on seat J when machine screw U .is loosened; while tightening Athe latter serves'to hold manifold Gr in place. In this design the top of casingVCf is shaped so as to form a receptacle or water to sealthe joint formed between manifold G and seat' J. Manifold G contains passages W and X and is designed to slide longitudinally on plane surface of seat J to position indicated by dash and dot lines in Fig. 7 when it is desired to operate impellers I in parallel. The position of manifold G shown in Figs. 5, 6, and 7 is such as tov connect impellers I in series. In this position water enters main suction opening S passing through passage T to impeller passage O and out through passage N and port Q into manifold 'passage X. Passage X leads'through'port L and passage K to impeller passage E and from there through discharge passage P to main discharge-openmg D. When manifold G is.

will connect the two discharge ports Q and p R with main discharge opening'D, thereby connecting impellers I in parallel.

Where the phrase two or more impellers section having Aopening and a plurality of communicating is used in the claims it Will be understood to mean either two or more independent impellers, or one or more compound or double service impellers containing two or more independent streams capable of being combined in parallel or series.

.It will also be understood that the invention is not to be limited to the exact form or arrangement of parts in either of the constructions shown in the accompanying drawings, but that modifications therein may be made Without departing from the invention as defined by the claims.

claim:

1. In a centrifugal or similar pump having one or more doul'ile-scrvice impellersv each capable of series ori parallel operation, a suction and a discharge passage formed in the pump connecting with each side of each impeller, and turnably mounted means for changing the connection of said passages so that the several sides of said impellers may be operated in series, in parallel, or in multiple series.

2. In a centrifugal or similar pump having one or more double-service impellers, each capable of series or parallel operation, a suction and a discharge passage formed in the pump connection with each side of cach impeller, and means for changingthe connection of said passages so that the several sides of said impellers in series, in parallel, or in sections movable one with other, a plurality of impellers journaled to rotate in one of said casing sections, suction and discharge passages formed in the casing car'ying the impellers and communicating with 'the` impellers, suction and discharge passages formed in the other casing section adapted to register with the suctiom and dscharge passages formed in the impeller casing, and means for moving one casing section with relation'to the other to bring different ports into register to permit the impellers to operate in parallel, in series or in multi-series.

4. A centrifugal pump comprising a base a main suction and discharge suction and discharge passages formed therein, an impeller casing movable with relation to the base section. a plurality of impelleis mounted in the impeller casing, a plurality of suction and discharge passages formed in the impeller casing communicating with the impellers and also with the suction and discharge passages in the base section, and means for moving the impeller casing with relation to the base section to bringdifferent ports into register to permit the impellers to operate 1n parallel, in series` or in multi-series.

5. In a centrifugal or similar pump having two or more impellers, a pump easing having independent suction and discharge passages formed therein for each of said impellers, a bas(l section with passages formed therein having ports arranged to connect the various combinations of said. suction and discharge passages in said pump casing so as to connect impellers in series, in parallel, or in multiple series, h v changing the relative position of said pump casing and said base section.

(S. A pump comprising a pair of casing sections turnably mounted one with relation to the other, a plurality of impellers journaled to rotate in one of said casing sections, suction and discharge passages formed in the casing containing the impellers comniunicating with thc impellers, suction .ind discharge passages formed in the other casing section adapted to register with the suction and discharge passages in the impeller casing, and means for turning one casing section with relation to the other to bring different ports into register to permit the impellers to operate in parallel, in series, or in multi-series.

7. Acentrifugal Section having a main suction and a discharge opening formed therein, a plurality of communicating suction and discharge passages, an impeller casing turnably mounted .with relation to the base section, a pluthe impeller casing, a plurality of suction and discharge passages formed in the irnpeller casing communicating with the impellers and also with the suction and discharge passages in' the base section, and means for turning the impeller casing with relation to the base section to bring differ` ent ports into register to permit the impellers to operate in parallel, in series, or in multi-series.

8. A centrifugal pump having a double impeller and a casing having communicating passages formed therein for connecting the two sides of said impeller in series.

9. In a centrifugal pump, a plurality of impellers, an impeller casing in which said impellers ai'e mounted having suction passages formcd thci'ein connecting with the impellers and discharge passages formed therein into which the impellers discharge, a base member supporting said easing having a plurality of passagesforined therein adapted to connect with the discharge and suction passages in the impeller casing, and means for changing the position of the iinpeiler casing with relation to the base membei and the passages formed therein to permit the impellers to be operated in parallel, in series, or in multi-series.

l0. In a centrifugal pump,

a plurality of impellers, an impeller casing in which 'said sages formed therein connecting with the impellers and discharge passages formed therein into which the impellers discharge, a base member supporting said casing having a plurality of passages formed therein vadapted to connect with the discharge and suction passages in the impeller casing, and means for turning the impeller casing with relation to the base section and. the passages formed therein to permit the impellers to be operated in parallel, in series, or in multi-series.

11. In a pump, a air of casing sections movable one with re ation to the other, each of the, casing sections -having passages with communicating ports formed therein, meansl for moving one Casin section with relation to the other so as to ring suitable ports of one casing into register with selected ports of the other casing so as to permit the impellers to operate in parallel, 1n series, or in multiple series, and means for maintaining a water seal between said movable casing sections.,

12. In'a centrifugal or similar pump, a pump casing surrounding the impellers thereof and having an outside cylindrical surface or seat with ports formed therein connecting independently with thel suction or discharge of each impeller requiring different connections, albase section havlng a cylindrical surface ofcontact with said cylindrical seat 'of said casing, manifold passages in said base sections having ports arranged in said surface of contact to connect said ports of said casing in various combina tions by rotating said casing onits longitudinal axis to selected positions, so as to connect said impellers in series, in parallel, or in multiple series, and a main suction and la) main discharge opening formed in said ase. s

1,3. In a centrifugal or similar pump, a pump casing surrounding the impellers thereof and having an outside cylindrical surface o r seat with ports formed therein connecting independently with the suction or discharge of each impeller requiring different connections, a base section having a main suction and a main discharge opening formed therein and a cylindrical surface of contact with said cylindrical casing, a receptacle for holding water over said surface of contact, manifold passages formed in said base having ports arranged in said surface adapted to connect with the ports in the casing in various-combinations by rotating saidl casing on its longitudinal axis to selected positions, so as to connect said irnpellers in series, in parallel, or in multiple series.

14:. In a centrifugal or similar pump, a pump casing having suction and discharge passages formed therein with ports in the outside surface of said casing, a base with a plurality of impellers,4

with said cylindrical seat of said casing,

a main suction and a main discharge openingl formed therein and passages with ports in the surface of Contact between said cas ing and said base, said ports connecting the ports in the casing with said main suction and main discharge openings in the base.

15. In a centrifugal or similar pump, a pump casing having suction and discharge passages formed therein with ports in the outside surface of said casing, a base with a main suction anda main discharge opening formed therein and passages with ports in the surface of contact between said casing and said base, said ports connecting the ports' in the casing with said main suction and main discharge openings in the base, `and receptacle for holding water over said surface o'f contact in order to-seal same.

16. In a centrifugal or similar pump, a casing surrounding the impellers thereof and having an outside cylindrical surface or seat with ports formed therein connecting with said impellers, an open-top base section having a cylindrical surface of contact ports Yformed in said surface of contact of said base communicating with the ports in the casing, and a main suction and a main discharge opening formed in said base having communicating passages connecting with the ports of said surface of contact. l

17. In a` centrifugal or similarpump, a

double impeller having two completely independent stream passages formed therein separated by a transverse partition, a suction opening and vanes having the usual circumferential discharge located each side of said transverse partition, a peripheral surface between and peripheral surfaces outside 'of the two y'said 'circumferential -dis 105 charges, said peripheral surfaces being de Y signed to run close to the inside cylindrical surface of the pump casing in `order to minimize leakage between the two said cir-cum# ferential discharges themselves and between each circumferential discharge and its corresponding suction opcning.

18. In a pump, a plurality of impellers, a pair of casing sections movable one with relation to the other, cach 0f the casing sec- 115 tions having passages with communicating ports formed therein, and means for moving one casing section with relation tothe other so as to bringsuitable ports of one casing into register with selected ports of the other casing so as to permit the impellers to operate in parallel, in series or in multiple 'means .for moving the casing sections'. with relation to each other to bring suitable ports of one casing into register with selected 1n multiple series.

20. A pump having a double impeller, a

ports 0f another easing section having passages and com municating ports formed therein, a manifold section having passages with ports formed therein, and means for moving one section with relation to the othe;` in order to bring different ports into register so as to permit the two sides ofthe double impeller to operate in parallel or in series.

2l. In a centrifugal or similar pump, a double impeller having two completely independent stream passages formed therein separated by a partition, a suction opening and vanes having the usual circumferential discharge located each side of said partition, a peripheral running face formed between the annular .discharge openings of the mpeller, and an annular peripheral flange on each side of the impeller having running faces formed thereon.

In a centrifugal or double impeller having two completely independent stream passages formed therein separatedby a partition, a suction opening and vanes having the usual circumferential discharge .located cach side of said partition, a peripheral running face formed between the annular discharge openings of the impeller, an annular, outwardly projecting Bange formed on eachside of the impeller 'around each suction opening, and a second concentric annular flange on each side of the in'ipeller, said linner and outer annular flanges having runing faces formed thereon.

WILLIAM DoUeLAs CARTER.

similar pump, a- 

